CVE-2024-26841

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

LoongArch: Update cpu_sibling_map when disabling nonboot CPUs

Update cpu_sibling_map when disabling nonboot CPUs by defining & calling

clear_cpu_sibling_map(), otherwise we get such errors on SMT systems:

jump label: negative count!

WARNING: CPU: 6 PID: 45 at kernel/jump_label.c:263 __static_key_slow_dec_cpuslocked+0xec/0x100

CPU: 6 PID: 45 Comm: cpuhp/6 Not tainted 6.8.0-rc5+ #1340

pc 90000000004c302c ra 90000000004c302c tp 90000001005bc000 sp 90000001005bfd20

a0 000000000000001b a1 900000000224c278 a2 90000001005bfb58 a3 900000000224c280

a4 900000000224c278 a5 90000001005bfb50 a6 0000000000000001 a7 0000000000000001

t0 ce87a4763eb5234a t1 ce87a4763eb5234a t2 0000000000000000 t3 0000000000000000

t4 0000000000000006 t5 0000000000000000 t6 0000000000000064 t7 0000000000001964

t8 000000000009ebf6 u0 9000000001f2a068 s9 0000000000000000 s0 900000000246a2d8

s1 ffffffffffffffff s2 ffffffffffffffff s3 90000000021518c0 s4

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References